In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11^th fringe on the other side, as measured from Q. If the wavelength of the light used is , then will be equal to

Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by . A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio

In an interference arrangement similar to Young's double slit experiment, the slits are illuminated with coherent microwave sources each of frequency . The sources are synchronized to have zero phase difference. The slits are separated by distance d = 150 m. The intensity I is measured as a function of , where is defined as shown. If I₀ is maximum intensity, then for is given by

In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on for constructive interference at P between the ray BP and reflected ray OP

A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate as shown. The observed interference fringes from this combination shall be

A ray of light of intensity I is incident on a parallel glass-slab at a point A as shown in fig. It undergoes partial reflection and refraction. At each reflection 25% of incident energy is reflected. The rays AB and AB undergo interference. The ratio is

If X and Y are two independent variables with means 5 and 10 and variances 4 and 9 respectively. If , then r (U, V) is equal to-

For the reaction  If 1 mol of   ,then the value of  in the reaction is

Light wave is travelling along y-direction. If the corresponding vector at any time is along the x-axis, the direction of vector at that time is along

The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to . The thickness of lead which will reduce the intensity to will be

If , then the value of  is-

An organic Compound  forms a precipitate with Tollens and Fehling’s regents. (A) has an isomer (B) . (B) reacts with 1 mol of  to form 1, 4 dibromo-2-butene. (A) and (B) are:

In alkaline medium,  and is itself reduced to  How many moles of   are oxidized by 1 mol of 

Figure represents a glass plate placed vertically on a horizontal table with a beam of Unpolarised light falling on its surface at the Polarising angle of with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a

An aromatic compound  on oxidation with acidic   gives dibasic acid.The compound (A) on nitration gives three isomeric nitro derivatives.The compound (A) is:

If A = {x : x N, x is a factor of 6} and B = {x N : x is a factor of 8} then is

When we have to find intersection of two sets, we have to find their common elements. When we have to find union of two sets, we have to consider all the elements of both the sets.